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[Dave]

Keen Dreams (aka Commander Keen 3.5) (1991) id Software, Inc.
Freeware

Math Rescue (1992) by Apogee Software, Ltd.
Sold here: http://www.3drealms.com/math/index.html

I'll hide the link, btw I still have it to check the other titles.

Edit: I don't have much time in these days.
(Link sent )

[Luchsen]

Street Shuffle | 1994 | MaxWare | In contact with developer if it's active shareware.
Another MasterMind For Windows (aka AMM4W) | 1994 | Davor Slamnig | [FREEWARE]
G-Quest: Search for the Colorstones | 1995 | William D. Rinehart | In contact with developer if it's active shareware.
G-Stones III | 1994 | William D. Rinehart | In contact with developer if it's active shareware.
Connectris | 1996 | William D. Rinehart | In contact with developer if it's active shareware.
Spider Run | 1994 | Soleau | [REJECTED: SOLD]
Charge | 1993 | Ernest L. Edgar | [FREEWARE]
GNU Chess | 1990 | Free Software Foundation | [FREEWARE]
Checkers | 1990 | Gregory Thatcher | [FREEWARE]
Hero's Heart | 1992 | Everett Kaser | In contact with developer if it's active shareware.

[Luchsen]

All hitherto pending titles:
Developer not existent anymore. [APPROVED]

[TotalAnarchy]

That link with the cds is full of limited shareware versions of the games. Plus it's dubious.

A free to try versions can be found here. The registration form is directed towards MaxWare, but since it is defunct there is no way to get the full version. Therefore [APPROVED]